Delphi TvideoGrabber USB摄像头

Question

Delphi TvideoGrabber对USB摄像头的图像不清晰，一晃摄像头，图像就模糊，该怎么设置

Answer 1

Delphi实现屏幕截图、窗口截图、指定区域截图

 

这个你可以参考参考

Use Jpeg
 
procedure TForm1.snapscreen(a,b,c,d:Integer);
var
bmpscreen:Tbitmap;
jpegscreen:Tjpegimage;
FullscreenCanvas:TCanvas;
dc:HDC;
sourceRect, destRect: TRect;
begin
try
dc:=getdc(0);
fullscreencanvas:=Tcanvas.Create;
fullscreencanvas.Handle:=dc;
bmpscreen:=Tbitmap.create;
bmpscreen.Width :=c-a;
bmpscreen.Height :=d-b;
sourcerect:=rect(0,0,c-a ,d-b );
destrect:= rect(a,b,c,d);
bmpscreen.Canvas.CopyRect(sourcerect,fullscreenCanvas,destrect);
jpegscreen:=Tjpegimage.Create ;
jpegscreen.Assign (bmpscreen);
jpegscreen.CompressionQuality:=100;
jpegscreen.SaveToFile(ExtractFilePath(ParamStr(0))+'tmp.jpg');
FullscreenCanvas.Free;
bmpscreen.Free;
jpegscreen.Free ;
ReleaseDC(0, DC);
except
end;
end; <br data-filtered="filtered">
procedure TForm1.Button1Click(Sender: TObject);
begin
snapscreen(self.Left,self.Top,Self.Left+self.Width,Self.Top+self.Height);
end;